This is how a lot of fiction operates though, it doesn't attempt to portray realism first. This is true in everything from western movies to rom coms. The story comes first, and the details have to be just believable enough to not stick out so much as to break immersion.

Although what breaks immersion varies. Someone who's at most shot a few cans or a deer won't perhaps question a bad guy being sent flying backwards from a revolver shot, a war veteran might see this as jarring and unrealistic.